3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; const true = false; if (true) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.24, 7.0.0 - 7.0.9
Fatal error: Cannot redeclare constant 'true' in /in/Wp4hi on line 3
Process exited with code 255.
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238.56 ms | 1396 KiB | 155 Q